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LTC3561AIDD-TRPBF Datasheet(PDF) 7 Page - Linear Technology

Part # LTC3561AIDD-TRPBF
Description  1A, 4MHz, Synchronous Step-Down DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3561AIDD-TRPBF Datasheet(HTML) 7 Page - Linear Technology

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LTC3561A
7
3561af
SHDN/RT (Pin 1): Combination Shutdown and Timing
Resistor Pin. The oscillator frequency is programmed by
connecting a resistor from this pin to ground. Forcing
this pin to SVIN causes the device to be shut down. In
shutdown all functions are disabled.
SGND (Pin 2): Signal Ground. All SGND and PGND pins
must be connected together through a thick copper trace
or ground plane.
SW (Pin 3): The Switch Node Connection to the Inductor.
This pin swings from PVIN to PGND.
PGND (Pin 4): Power Ground. Connect to the (–) terminal
of COUT, and (–) terminal of CIN. All SGND and PGND pins
must be connected together through a thick copper trace
or ground plane.
PVIN (Pin 5): Main Supply Pin. Must be closely decoupled
to PGND.
PIN FUNCTIONS
SVIN (Pin 6): The Signal Power Pin. All active circuitry
is powered from this pin. Must be closely decoupled to
SGND. SVIN must be greater than or equal to PVIN.
VFB (Pin 7): Receives the feedback voltage from the ex-
ternal resistive divider across the output. Nominal voltage
for this pin is 0.8V.
ITH(Pin8):ErrorAmplifierCompensationPoint.Thecurrent
comparator threshold increases with this control voltage.
Nominal voltage range for this pin is 0.4V to 1.4V.
Exposed Pad (Pin 9): Signal Ground. All small-signal
components and compensation components should be
connected to this ground (see Board Layout Consider-
ations). Must be soldered to electrical ground on PCB.
All SGND and PGND pins must be connected together
through a thick copper trace or ground plane.
NOMINAL (V)
ABSOLUTE MAX (V)
PIN
NAME
DESCRIPTION
MIN
TYP
MAX
MIN
MAX
1
SHDN/RT
Shutdown/Timing Resistor
–0.3
0.8
SVIN
–0.3
SVIN + 0.3
2
SGND
Signal Ground
0
3
SW
Switch Node
0
PVIN
–0.3
PVIN + 0.3
4
PGND
Main Power Ground
0
5PVIN
Main Power Supply
–0.3
5.5
–0.3
SVIN + 0.3
6SVIN
Signal Power Supply
2.5
5.5
–0.3
6
7VFB
Output Feedback Pin
0
0.8
1.0
–0.3
SVIN + 0.3
8ITH
Error Amplifier Compensation and Run Pin
0.4
1.4
–0.3
SVIN + 0.3


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